1 Answer
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The error log tells you that it can't find the openpyxl. You might install that lib for an other python interpreter, that's is declare in you path variable.

As I can see you had install Qgis in Windows And you took the standalone installer (because it went in the programme folder). Search in Qgis programme folder the osgeo shell icon. From there run pip install openpyxl. if it doesn't have pip 2 choices get the lib from there
or get the osgeo installer which is more customizable (I don't know I can say that).